EP4295742A1 - Geschirrspülmaschine mit einer wärmepumpenvorrichtung - Google Patents

Geschirrspülmaschine mit einer wärmepumpenvorrichtung Download PDF

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Publication number
EP4295742A1
EP4295742A1 EP23179500.6A EP23179500A EP4295742A1 EP 4295742 A1 EP4295742 A1 EP 4295742A1 EP 23179500 A EP23179500 A EP 23179500A EP 4295742 A1 EP4295742 A1 EP 4295742A1
Authority
EP
European Patent Office
Prior art keywords
evaporator
tub
condenser
refrigerant
dishwasher
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23179500.6A
Other languages
English (en)
French (fr)
Inventor
Seungyoun KIM
Hoo Sun Lee
Kwangsoo Jung
Doo Hyun Kim
Youngsoo Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP4295742A1 publication Critical patent/EP4295742A1/de
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4291—Recovery arrangements, e.g. for the recovery of energy or water
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4246—Details of the tub
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/06—Air heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/06—Heat pumps characterised by the source of low potential heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4219—Water recirculation
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4285—Water-heater arrangements

Definitions

  • the present disclosure relates a dishwasher including a heat pump apparatus, more particularly, a dishwasher including a heat pump apparatus with a structure of improved energy efficiency in case of heating wash water.
  • a dishwasher is an electric appliance that washes dishes and cooking utensils stored inside by spraying wash water.
  • the wash water used in the washing may include a washing detergent.
  • a conventional dishwasher may include a tub defining a washing space, a storage part accommodating washing targets inside the tub, a spray arm spraying wash water to the storage part, and a sump storing wash water and supplying the wash water to the spray arm.
  • wash water When the dishwasher is used to wash dishes, wash water may be heated and used in order to increase a washing effect.
  • An electric heater may be used as a heating device for heating wash water. Meanwhile, as another method, wash water may be heated by a heat pump apparatus instead of the electric heater.
  • the heat pump apparatus has high energy efficiency, compared with the electric heater. Accordingly, when wash water is heated by using the heat pump apparatus, electricity consumption can be reduced.
  • FIG. 1 is a view of the dishwasher disclosed in the background art.
  • the heat pump includes a condenser 8 provided on a bottom surface of a tub 1, in which dishes are accommodated and washed, to heat the bottom surface of the tub 1 by emitting heat, and two evaporators 10a and 10b configured to absorb heat.
  • the evaporators 10a and 10b may include a first evaporator 10a disposed on a lateral wall of the tub 1 and configured to absorb heat from the tub 1, and a second evaporator 10b configured to absorb heat from a water discharge area 16.
  • the first evaporator 10a may evaporate a refrigerant flowing therein by absorbing heat from the inside of the tub 1 whose temperature is higher than that of the outside due to the heated water or air.
  • the first evaporator 10a may absorb heat from the tub 1, while the condenser 8 may be configured to discharge heat to the tub 1. Accordingly, a significant amount of the heat obtained from the condenser 8 will be lost by the first evaporator 10a again.
  • the wash water held inside the tub 1 may be heated by the heat remaining after the first evaporator 10a absorbs the heat gained from the condenser 8. Accordingly, energy efficiency of the heat pump is inevitably very low.
  • Both the condenser 8 and the first evaporator 10a are disposed in the same tub 1 in the prior art, so that the application of heat to the tub 1 and the removal of heat from the tub may occur together. Accordingly, the amount of heat for heating the wash water inside the tub becomes very small.
  • One objective of the present disclosure is to provide a dishwasher having an improved energy efficiency structure that may heat wash water by using a heat pump apparatus instead of an electric heater.
  • a further object of the present disclosure is to provide a heat pump apparatus having a structure configured to evaporate a refrigerant by using both air and water as a heating medium, and a dishwasher including the same.
  • a still further object of the present disclosure is to provide a heat pump apparatus having a structure configured to noticeably improve energy efficiency by heating wash water and suppressing heat loss of a tub through vaporization of a refrigerant that uses a plurality of evaporators separately provided from the tub, and a dishwasher including the same.
  • a dishwasher may include a heat pump apparatus.
  • the heat pump apparatus may be mounted to the dishwasher and configured to heat wash water introduced to the tub, and may include a compressor, a condenser, an expansion valve and an evaporation device.
  • the compressor, the condenser, the expansion valve and the evaporation device may be connected by a pipe. Refrigerant may flow through the pipe.
  • the compressor may be configured to compress refrigerant and discharge a high-temperature-and-high pressure refrigerant.
  • the condenser may receive refrigerant introduced from the condenser and may be configured to heat water introduced into the tub. Accordingly, the refrigerant may be condensed to liquid from gas by being deprived of heat while flowing through the condenser, and expand the refrigerant. The refrigerant may be expanded and cooled while passing through the expansion valve.
  • the evaporation device may have refrigerant introduced from the expansion valve and discharge the refrigerant to the compressor, and may evaporate the refrigerant by absorbing heat from room-temperature air and stored water.
  • the refrigerant may be evaporated to gas by absorbing heat while passing through the evaporation device.
  • the evaporation device may include a first evaporator and a second evaporation device.
  • the refrigerant may discharge heat of QH while passing through the condenser.
  • the heat emitted from the condenser may be used to heat wash water.
  • the heat pump apparatus may include a blowing fan configured to blow air toward the first evaporator.
  • the heat pump apparatus may use two evaporators.
  • One evaporator is a first evaporator in which heat transfer is generated by air.
  • the other one is a second evaporator in which heat transfer is generated by water.
  • two evaporators with a relatively small volume may be separately provided and each of the evaporators may be distributed and disposed in a space of the dishwasher.
  • the dishwasher may include a sump provided under the tub and configured to store wash water therein; and a spray arm provided in the tub and connected with the sump, the spray arm configured to spray wash water.
  • the condenser and the sump may be connected with each other by a pipe.
  • the dishwasher may include a first water supply path and a water supply pump.
  • the first water supply path may connect the sump and the spray arm with each other and wash water may flow therethrough.
  • the water supply pump may be disposed in the first water supply path and configured to supply wash water to the spray arm from the sump.
  • the dishwasher may further include a circulation path and a circulation pump.
  • the circulation path may be connected with the condenser and the sump, and wash water may circulate therethrough.
  • the circulation path may be connected with the condenser and wash water may be heated by absorbing heat from the refrigerant flowing the condenser, while passing through the condenser via the circulation path.
  • the refrigerant may be condensed by being deprived of heat in the condenser by the wash water.
  • the circulation pump may be disposed in the circulation path and configured to circulate wash water between the condenser and the sump.
  • the wash water may be introduced and heated by the circulation pump.
  • the heated wash water discharged from the condenser may be introduced to the sump through the circulation path.
  • the heated wash water introduced to the sump may be pumped by the water supply path and introduced to the spray arm to be sprayed into the tub.
  • wash water may sequentially pass through the sump, the condenser and the spray arm to be sprayed into the tub.
  • all of the wash water introduced to the sump may flow to the spray arm after passing through the condenser.
  • a dishwasher may include a tub defining a washing space and accommodating dishes; and a heat pump apparatus configured to heat wash water introduced into the tub.
  • the heat pump apparatus may include a compressor configured to compress refrigerant; a condenser to which refrigerant is introduced from the condenser, the condenser configured to heat water introduced into the tub; an expansion valve to which refrigerant is introduced from the condenser, the expansion valve configured to expand refrigerant; a first evaporator to which refrigerant is introduced from the expansion valve, the first evaporator configured to evaporate refrigerant by absorbing heat from room-temperature air; and a second evaporator to which refrigerant is introduced from the first evaporator, the second evaporator configured to discharge refrigerant to the compressor and evaporate refrigerant by absorbing heat from stored water.
  • the dishwasher may include a blowing fan disposed to face the first evaporator and configured to blow external air toward the first evaporator.
  • the dishwasher may further include a sump provided under the tub and configured to store wash water therein; and a spray arm provided in the tub and connected with the sump, the spray arm configured to spray wash water.
  • the dishwasher may further include a first water supply path connecting the sump and the spray arm with each other; and a water supply pump disposed in the first water supply path and configured to supply wash water to the spray arm from the sump.
  • the dishwasher may further include a circulation path connected with the condenser and the sump, the circulation path through which wash water circulates; and a circulation pump disposed in the circulation path and configured to circulate wash water between the condenser and the sump.
  • wash water may sequentially pass through the sump, the condenser and the spray arm to be sprayed into the tub.
  • the dishwasher may further include a second water supply path connecting the sump and the condenser with each other; a water supply pump disposed in the second water supply path and configured to supply wash water to the spray arm; and a third water supply path connecting the condenser and the spray arm with each other.
  • the blowing fan may be disposed between the sump and the first evaporator, and a blowing direction of the blowing fan may be provided in a direction opposite to a direction facing the sump.
  • the dishwasher may further include a base provided under the tub and supporting the tub.
  • the condenser, the first evaporator and the blowing fan may be disposed in the base.
  • the sump may be disposed in a predetermined area inside the base, and the condenser, the first evaporator and the blowing fan may be disposed at a position that avoids the area in which the sump is provided.
  • the second evaporator is disposed on one side of the tub.
  • the tub may include a lateral wall forming one side, the second evaporator ay be disposed outside the tub to face the lateral wall, and an insulation member may be disposed between the lateral wall and the second evaporator.
  • the second evaporator may include a water tank having a space in which water is stored; and a tube disposed in the inner space of the water tank and having a plurality of bending portions, the tube through which refrigerant flows.
  • the water tank may have a shape corresponding to the lateral wall of the tub and a predetermined thickness to form a space therein.
  • the condenser may be provided as a plate heat exchanger.
  • a dishwasher may include a tub defining a washing space and accommodating dishes; and a heat pump apparatus configured to heat wash water introduced into the tub; wherein the heat pump apparatus comprises a compressor configured to compress refrigerant; a condenser to which refrigerant is introduced from the condenser, the condenser configured to heat water introduced into the tub; an expansion valve to which refrigerant is introduced from the condenser, the expansion valve configured to expand refrigerant; a first evaporator to which refrigerant is introduced from the expansion valve, the first evaporator configured to evaporate refrigerant by absorbing heat from room-temperature air; and a second evaporator to which refrigerant is introduced from the first evaporator, the second evaporator configured to discharge refrigerant to the compressor and evaporate refrigerant by absorbing heat from stored water, wherein the condenser is provided as a plate heat exchanger.
  • a dishwasher may include a tub defining a washing space and accommodating dishes; and a heat pump apparatus configured to heat wash water introduced into the tub; wherein the heat pump apparatus comprises a compressor configured to compress refrigerant; a condenser to which refrigerant is introduced from the condenser, the condenser configured to heat water introduced into the tub; an expansion valve to which refrigerant is introduced from the condenser, the expansion valve configured to expand refrigerant; a first evaporator to which refrigerant is introduced from the expansion valve, the first evaporator configured to evaporate refrigerant by absorbing heat from room-temperature air; and a second evaporator to which refrigerant is introduced from the first evaporator, the second evaporator configured to discharge refrigerant to the compressor and evaporate refrigerant by absorbing heat from stored water, wherein the second evaporator is disposed on one side of the tub and the second evaporator is a tube-type heat exchanger.
  • the evaporation device including the first evaporator in which heat transfer is generated by air and the second evaporator in which heat transfer is generated by water may be used. Accordingly, small two evaporators having a relatively small volume may be separately provided. Each of the evaporators may be distributed in the space of the dishwasher. Since the evaporation device having a considerably large capacity is disposed in the limited space of the dishwasher, space efficiency of the dishwasher may be improved. In addition, the amount of air flow may be reduced so that power consumption of the blowing fan can be reduced and the size of noise generated by the operation of the blowing fan may be remarkably reduced.
  • the blowing fan may be disposed between the sump and the first evaporator.
  • the blowing direction of the blowing fan may be an opposite to the direction facing the sump. Accordingly, the blowing fan forcibly blows air toward the first evaporator, not to the sup. Cooling the heated wash water stored in the sump may be effectively suppressed by the air forcibly blown by the blowing fan, thereby improving energy efficiency of the dishwasher.
  • the second evaporator may be disposed on one side of the tub in the dishwasher according to the present disclosure so that there may be no need to change the size and structure of the second evaporator according to the space of the base in order to dispose the second evaporator in the limited space of the base, thereby improving the energy efficiency of the dishwasher.
  • the insulation member may be disposed between the second evaporator and the tub to block the heated wash water existing in the tub from being deprived of heat by the second evaporator. Accordingly, it may be effectively suppressed that the temperature of the heated wash water existing in the tub becomes lower by the second evaporator even when the second evaporator is disposed on one side of the tub.
  • the condenser may be manufactured as the plate heat exchanger so that the overall volume may be reduced, thereby easily mounting the condenser in the base having the limited mounting space. Accordingly, the space efficiency of the dishwasher may be improved.
  • the plate heat exchanger may control the capacity of heat exchange by changing the distance between plates. Constituting the condenser using the plate heat exchanger may effectively respond to change in the heat exchange capacity required by the condenser.
  • first means a first component
  • second means a second component unless stated to the contrary.
  • each component can be provided as a single one or a plurality of ones, unless explicitly stated to the contrary.
  • a and/or B as used herein can denote A, B or A and B, and the terms “C to D” can denote C or greater and D or less, unless stated to the contrary.
  • up-down direction means an up-and-down direction of a dishwasher that is installed for daily use.
  • Left-right direction means a direction orthogonal to the up-down direction
  • front-back direction means a direction orthogonal to both the up-down direction and the left-right direction.
  • Both side directions or “lateral directions” have the same meaning as the left-right direction.
  • FIG. 2 is a schematic sectional view of a dishwasher according to an embodiment.
  • the dishwasher may include a housing defining an exterior design; a tub 2 defining a washing space 21 inside the housing and accommodating dishes as washing targets; a door 3 rotatably coupled to a base 8 and disposed in front of the tub 2 to open and close the tub 2; a sump 4 provided under the tub and storing wash water; a storage part 5 provided inside the tub 2 and storing washing targets therein; and a spray arm 20 spraying wash water toward the washing targets stored in the storage part.
  • the dishes may be bowls, plates, spoons and chopsticks and other cooking utensils, for example.
  • the tub 2 may define the washing space 21 and accommodate dishes.
  • the storage part 5 and the spray arm 20 may be provided in the washing space 21.
  • the tub may have one open surface and the open surface may be open and closed by the door 3.
  • the door 3 may be rotatably coupled to the housing to selectively open and close the washing space 21.
  • a lower portion of the door 3 may be hingedly coupled to the housing.
  • the door 3 may rotatable on a hinge to open and close the tub 2.
  • the storage part 5 may be pulled out of the dishwasher and the pulled-out storage part 5 may be supported by the door 3.
  • the sump 4 may include a storage portion 41 storing wash water; a sump cover 42 that separates the storage part 41 from the tub 2; a water supply portion 43 supplying wash water to the storage portion 41 from the outside; a water discharge portion discharging the wash water stored in the storage portion 41 to the outside; and a water supply pump 45 and a supply path 46 for supply the wash water of the storage part 41 to the spray arm 20.
  • the sump cover 42 may be provided above the sump 4 to separate the sump 2 from the tub 2.
  • the sump cover 42 may include a plurality of collecting holes for collecting holes for collecting the wash water sprayed into the washing space 21 through the spray arm 20.
  • the wash water sprayed through the spray arm 20 may fall to a lower portion of the washing space 21, and may be collected again in the storage portion 41 of the sump 4 after passing through the sump cover 42.
  • the water supply pump 45 may be provided in a side or lower area of the storage portion 41, and configured to supply wash water to the spray arm 20.
  • One end of the water supply pump 45 may be connected with the storage portion 41 and the other end thereof may be connected to the supply path 46.
  • An impeller 451, a motor 453, etc. may be provided inside the water supply pump 45. When the motor 453 is supplied electric power, the impeller 451 may rotate and the wash water stored in the storage portion 41 may be supplied to the spray arm 20 via the supply path 46.
  • the supply path 46 may selectively supply the wash water to the spray arm 20 from the water supply pump 45.
  • the supply path 46 may include a first supply path 461 connected to a lower spray arm 26, an upper spray arm 27, and a supply path conversion valve 465 for selectively opening and closing the supply paths 461, 463 and 467. At this time, the supply path conversion valve 465 may control the supply paths 461, 463 and 467 to be opened sequentially or simultaneously.
  • At least one storage part 5 for storing dishes may be provided inside the washing space 21.
  • FIG. 2 shows a dishwasher including two storage parts 5 but the embodiment is not limited thereto.
  • the dishwasher may include only one storage part or three or more storage parts.
  • the number of the spray arms may be variable based on the number of the storage parts.
  • the storage part 5 may include a lower rack 51 and an upper rack 53 for storing dishes.
  • the lower rack 51 may be disposed in the washing space 21 and dishes may be stored on the lower rack.
  • the upper rack 53 may be disposed above the lower rack 51 and dishes may be stored on the upper rack.
  • a top rack may be disposed in a space defined between an upper area of the upper rack 53 and a top nozzle 29. Dishes may be stored on the top rack.
  • the lower rack 51 may be disposed above the sump 4 and the upper rack 53 may be disposed above the lower rack 51.
  • the lower rack 51, the upper rack 53 and the top rack may be pulled out through the open surface of the tub 2.
  • a rail-type holder may be provided on an inner surface of the tub 2 and a wheel may be provided on a lower surface of the rack 51, 53.
  • a user may pull out the storage part 5 and put dishes therein or take out the dishes having been washed.
  • the spray arm may be provided inside the tub 2 and configured to spray wash water toward the dishes stored in the storage part 5.
  • the spray arm 20 may include a lower spray arm 26, an upper spray arm 27 and a top nozzle 29.
  • the lower spray arm 26 may be rotatably provided below the lower rack 51 and spray wash water to the dishes.
  • the upper spray arm 27 may be rotatably provided between the lower rack 51 and the upper rack 53, and may spray wash water to the dishes.
  • the lower ram 26 may be rotatably mounted on the sump cover 42 and configured to spray wash water toward the dishes stored in the lower rack 27.
  • the upper spray arm 27 may be disposed above the lower spray arm 26, to spray wash water toward the dishes stored in the upper rack 53.
  • the top nozzle 29 may be provided in an upper area of the washing space 21 and configured to spray wash water to the lower rack 51 and the upper rack 53.
  • the first supply path 461 may supply wash water to the lower spray arm 26.
  • the second supply path 463 and 467 may supply wash water to the upper spray arm 27 and the top nozzle 29.
  • the dishwasher may include a base 8.
  • the base may be disposed on a bottom of the tub 2 and the tub 2 may be mounted on the base 8.
  • the base 8 may provide a space in which the sump 4 is accommodated, and also a space in which a pump, a hot air supply device 100 and other various mechanisms provided in the dishwasher are accommodated.
  • the base 8 may support the entire dishwasher with its outer wall and the outer wall may define the space in which various mechanism are accommodated.
  • the dishwasher according to an embodiment may spray high-temperature wash water to the dishes accommodated in the tub 2 by heating the wash water introduced into the tub, thereby increasing washing efficiency for the dishes and performance of the dishwasher.
  • the dishwasher may include a heat pump apparatus 10 configured to heat the wash water introduced into the tub 2.
  • the heat pump apparatus 10 may heat the wash water so that the dishes can be washed by high-temperature wash water to improve the performance of the dishwasher.
  • an electric heater heating wash water by converting an electric energy into heat may be used as a device for heating wash water.
  • a coefficient of performance COP is a measure used to indicate the energy efficiency of the electric heater and the heat pump apparatus 10. The higher the coefficient of performance, the higher the energy efficiency of the device.
  • the performance coefficient of the electric heater is only 1 at the maximum.
  • the dishwasher according to the embodiment may heat wash water by using the heat pump apparatus 10 instead of the electric heater.
  • the heat pump apparatus 10 may move heat to a high-temperature thermal reservoir from a low-temperature thermal reservoir to make high-temperature heat, and heat the wash water by using the high-temperature heat.
  • the heat pump apparatus 10 may have the coefficient of performance exceeding 1, and most of the coefficients of performance of the heat pump used actually may exceed 1. Accordingly, the dishwasher according to the embodiment that may heat wash water by using the heat pump apparatus 10 may have an increased energy efficiency, compared to the conventional dishwasher heating wash water by using the electric heater.
  • FIG. 3 is a view showing piping of a heat pump apparatus according to an embodiment.
  • a flow direction of the refrigerant and wash water is illustrated as an arrow in a piping system and a flow direction of air is illustrated as a separate arrow.
  • the heat pump apparatus 10 may be mounted in the dishwasher to heat the wash water introduced into the tub 2.
  • the heat pump apparatus 10 may include a compressor 100, a condenser 200, an expansion valve 300 and an evaporation device 400 and 500.
  • the compressor 100, the condenser 200, the expansion valve 300 and the evaporation device 400 and 500 may be connected via a piping system.
  • a refrigerant may flow through the piping.
  • the refrigerant may function as a working fluid that absorbs or dissipates heat by changing its phase from liquid to gas or conversely from gas to liquid, while sequentially circulating through the compressor 100, the condenser 200, the expansion valve 300 and the evaporation device 400 and 500.
  • the compressor 100 may compress a refrigerant and discharge a high-temperature-high-pressure refrigerant.
  • the condenser 200 may be provided with the refrigerant from the compressor 100 and heat the water introduced into the tub. Accordingly, the refrigerant may loss heat while flowing through the condenser 200 only to be condensed from gas to liquid.
  • the refrigerant may be introduced into the expansion valve 300 from the condenser and the expansion valve may expand the refrigerant.
  • the refrigerant may be expanded to be chilled while passing through the expansion valve 300.
  • the evaporation device 400 and 500 may be provided with the refrigerant from the expansion valve 300 and may discharge the refrigerant to the compressor 100 to evaporate the refrigerant by absorbing heat from room-temperature air and the stored water.
  • the refrigerant may be evaporated into gas by absorbing heat while passing through the evaporation device 400 and 500.
  • the evaporation device 400 and 500 may include a first evaporator 400 and a second evaporator 500.
  • the first evaporator 400 may be provided with the refrigerant from the expansion valve 300 and evaporate by absorbing heat from room-temperature air. In other words, the first evaporator 400 may evaporate the refrigerant by absorbing heat from room-temperature air nearby, while the refrigerant is flowing therein.
  • the second evaporator 500 may be provided with the refrigerant from the first evaporator 400 and discharge the refrigerant to the compressor 100. Then, the second evaporator may evaporator the refrigerant by absorbing heat from the stored water. In other words, the second evaporator 500 may be connected with the first evaporator and the refrigerant may flow therein so that the second evaporator 500 may evaporate the refrigerant by absorbing heat from the stored water.
  • the refrigerant may absorb or dissipate heat by changing its phase while circulating the compressor 100, the condenser 200, the expansion valve 300, the first evaporator 400 and the second evaporator 500.
  • the refrigerant may be compressed to be a high-temperature-and-high-pressure refrigerant, while passing through the compressor 100.
  • the refrigerant may emit QH of heat while passing through the condenser 200.
  • the heat emitted from the condenser 200 may be used in heating the wash water. accordingly, flow paths through which the refrigerant and the wash water pass, respectively, may be provided in the condenser 200.
  • the refrigerant may emit heat while passing through the condenser 200 and it may be condensed into liquid from gas.
  • the refrigerant having passed through the condenser 200 may be a mixture of liquid and gas that has a very small gas ratio or may be a subcooled liquid.
  • the refrigerant discharged from the condenser 200 may be expanded while passing through the expansion valve 300.
  • the temperature of the refrigerant may become lower and become a mixture gas of gas and liquid.
  • the refrigerant discharged from the expansion valve 300 may be evaporated by absorbing heat of QL1 from room-temperature air nearby, while passing through the first evaporator 400 so that the gas ratio of the refrigerant may increase.
  • the room-temperature air nearby means the temperature of the space in which the dishwasher is installed, and it may be about 15°C to 30°C.
  • the embodiment is not limited thereto and the room-temperature may vary based on the change of the surrounding environment and the change of the season.
  • the refrigerant emitted from the first evaporator 400 may be evaporated by absorbing heat of QL2 from the stored water while passing through the second evaporator 500, so that the gas ratio of the refrigerant may increase more.
  • the refrigerant discharged from the second evaporator 500 may be a mixed gas having a very small liquid ratio or a superheated gas.
  • the refrigerant discharged from the second evaporator 500 may be introduced into the compressor 100 again and compressed to be high-temperature-and-high-pressure gas. As described above, the refrigerant may change its phase while circulating the heat pump apparatus 10 so that the refrigerant may absorb heat from the first evaporator 400 and the second evaporator 500, and may emit heat from the condenser 200. The heat emitted from the condenser 200 may heat the wash water.
  • the heat pump apparatus 10 may absorb heat of QL1+QL2 from room-temperature air and the stored water, which are low-temperature heat reservoirs, and emit heat to the wash water, which is a high-temperature heat reservoir, only to heat the wash water.
  • the heat pump apparatus 10 may include a blowing fan 600 for blowing air toward the first evaporator 400.
  • the blowing fan 600 may be disposed to face the evaporation device 400 and 500, and configured to blow external air toward the evaporation device 400 and 500. Specifically, the blowing fan 600 may be disposed to face the first evaporator 400 and configured to blow external air toward the first evaporator 400.
  • the blowing fan 600 may forcibly flow a large amount of air toward the first evaporator 400 by blowing room-temperature air nearby to the first evaporator 400, thereby improving heat transfer efficiency between air and the first evaporator 400.
  • the heat pump may use two evaporators.
  • One evaporator may be the first evaporator 400 in which heat transfer is generated by air and the other one is the second evaporator 500 in which heat transfer is generated by water.
  • the amount of heat transfer between the evaporator and the refrigerant required to heat the wash water may be quite great. If the heat pump is configuring using only one evaporator in which heat is transferred by water, the volume of the evaporator could become excessively large because the water storage area has to be large to allow a considerably large amount of heat transfer to occur between the water and the refrigerant. Since the space capable of accommodating the evaporator in the dishwasher is limited, it may be difficult or impossible to prepare a space to mount such a large evaporator.
  • the heat pump is configuring using only one evaporator in which heat is transferred by air
  • air has a lower specific heat than water so that the amount of heat transfer could be reduced compared to the case of the water. accordingly, in order to allow a considerably large amount of heat transfer between the air and the refrigerant to occur, the volume of the evaporator has to be very large or the flow rate of air has to be large.
  • the evaporation device 400 and 500 including the first evaporator 400 in which heat is transferred by water and the second evaporator 500 in which heat is transferred by water may be used. Accordingly, two small-volumed evaporators may be separately provided. Each of the evaporators may be separately disposed in the space of the dishwasher. Due to this structure, the evaporator device 40 and 500 having a considerably large capacity may be disposed in a limited space of the dishwasher, thereby improving space efficiency of the dishwasher. In addition, the air flow amount may be reduced and the power consumption of the blowing fan 600 may be reduced then, so that the size of the noise generated by the operation of the blowing fan 600 can be remarkably reduced.
  • FIG 4 is a piping diagram to describe a piping connection structure between a tub 10 and a heat pump apparatus 10 according to an embodiment.
  • the dishwasher may include a sump 4 provided under the tub 2 to store wash water; and a spray arm 20 provided in the tub 2, while being connected with the sump 4, to spray wash water.
  • a sump 4 provided under the tub 2 to store wash water
  • a spray arm 20 provided in the tub 2, while being connected with the sump 4, to spray wash water.
  • the condenser 200 and the sump 4 may be connected through a pipe to circulate wash water.
  • the dishwasher may include a first water supply path 31 and a water supply pump 45.
  • the first water supply path 31 may be provided in the supply path 46.
  • the first water supply path 31 may connect the sump 4 and the spray arm 20 with each other, and wash water may circulate through the first water supply path 31.
  • the water supply pump 45 may be disposed in the first water supply path 31 and supply the wash water to the spray arm 20 from the sump 4. The detailed structure of the water supply pump 45 is already described above.
  • the dishwasher may include a circulation path 50 and a circulation pump 60.
  • the circulation path 50 may be provided in the supply path 46.
  • the circulation path 50 may be connected with the condenser 200 and the sump 4, and wash water may circulate through the circulation path 50.
  • the circulation path 50 may be connected with the condenser 300 and the wash water may be heated by absorbing heat from a refrigerant flowing through the condenser 200, while passing through the condenser 200.
  • the refrigerant may loss heat and the heat is absorbed by the wash water to be condensed in the condenser 200.
  • the circulation pump 60 may be disposed in the circulation path 50 and configured to circulate the wash water between the condenser 200 and the sump 4.
  • the wash water may be introduced into the condenser 200 by the circulation pump 60 to be heated.
  • the heated wash water discharged from the condenser 200 maya be introduced into the sump 4 through the circulation path 50, and the wash water introduced into the sump 4 may be pumped by the water supply pump 45 to be introduced into the spray arm 20 and sprayed to the tub 2.
  • the wash water may fall from the tub 2 to be introduced into the sump 4.
  • the sump 4 may be disposed under the tub 2. Accordingly, the wash water may fall under the tub 2 to be introduced into the sump 4 by the gravity.
  • wash water introduced into the sump 4 may flow between the condenser 200 and the ump 4 and the other wash water may flow between the sump 4 and the tub.
  • the water supply pump 45 and the circulation pump 60 may operate simultaneously.
  • the wash water heated by the condenser 200 and the relatively cold wash water falling from the tub 2 may be continuously mixed, and the temperature of the wash water may constantly increase inside the sump 4. Accordingly, the wash water sprayed to the tub 2 through the spray arm 20 after flowing to the spray arm 20 from the sump 4 may be heated.
  • FIG. 5 is a piping diagram to describe a piping connection structure between a tub and a heat pump apparatus according to another embodiment. Repeated description is omitted hereinafter.
  • wash water may fall from the tub 2 and be introduced into the sump 4. After that, the wash water may sequentially pass through the sump 4, the condenser 200 and the spray arm 20 to be sprayed into the tub 2. In other words, all of the wash water introduced into the sump 20 may pass through the condenser and be introduced into the spray arm 20,
  • the dishwasher shown in FIG. 5 may include a second water supply path 32, a water supply pump 45 and a third water supply path 33.
  • the second water supply path 32 and the third water supply path 33 may be provided in the supply path 46.
  • the second water supply path 32 may connect the sump 4 and the condenser 200 with each other.
  • the water supply pump 45 may be disposed in the second water supply path 32 to supply the wash water to the spray arm 20.
  • the water supply pump 45 may be the same as what is described above, except that it is disposed in the second water supply path 32.
  • the third water supply path 33 may connect the condenser 200 and the spray arm 20 with each other.
  • the wash water introduced into the condenser 200 through the second water supply path 32 may be heated while passing through the condenser 200.
  • the heated wash water discharged from the condenser 200 may be introduced into the spray arm 20 through the third water supply path 33 to be sprayed into the tub 2.
  • the tub 2, the sump 4, the water supply pump 45 and the condenser 200 may form one circulation flow system. Accordingly, without additionally providing a separate pump, the wash water may be heated by only the existing water supply pump 45 while passing through the condenser, and the heated wash water may be introduced into the spray arm 20.
  • FIG. 6 is a perspective view partially showing a dishwasher according to an embodiment.
  • FIG. 7 is a view of FIG. 6 , from a different direction.
  • FIG. 6 shows that a bottom plate 2b of the tub 2 is transparent so that the inside of the base 8 provided under the bottom plate 2b may be visible.
  • the structure of the heat pump apparatus 10 will be described in detail.
  • the evaporation device 400 and 500 including the first evaporator 400 and the second evaporator 500 is a device configured to absorb heat. Accordingly, when heat exchange occurs between the tub 2 in which the wash water is sprayed and the evaporation device 400 and 500, the heat of the wash water could be taken by the evaporation device 400 and 500 not to be heated sufficiently. As a result, energy efficiency could become lower. That is a problem applied even to the sump 4 in which the heated wash water circulates.
  • the evaporation device 400 and 500 may be spaced a preset distance apart from the tub 2 and the sump 4 or insulated therefrom to suppress heat exchange between the evaporation device 400 and 500 and the wash water.
  • Such the structure is to solve the disadvantage of the prior mentioned above, which will be described in detail.
  • the dishwasher may include the base 8 provided under the tub 2 and supporting the tub 2.
  • the condenser 200, the first evaporator 400 and the blowing fan 600 may be disposed in the base 8.
  • the inside of the base 8 may be provided as a space. Accordingly, various components of the dishwasher may be disposed inside the space of the base 8. For example, the sump 4 may be disposed inside the base 8.
  • At least predetermined area of the water supply portion 43 may be disposed in the base 8.
  • a water supply hole 43a may be formed in the water supply portion 43 to discharge wash water to the tub 2.
  • the water supply hole 43a may penetrate the bottom plate 2b of the tub to introduce the wash water into the tub therethrough.
  • the compressor 100 provided in the heat pump apparatus 10 may be disposed in the base.
  • the sump 4 may be disposed in some area of the base 8, and the condenser 200, the first evaporator 400 and the blowing fan 600 may be disposed in another area, avoiding the position of the sump 4. Since the sump 4 has to make the wash water circulate therein smoothly during the washing process, it is appropriate to dispose the condenser 200, the first evaporator 400 and the blowing fan 600, which could obstruct the flow of wash water in the sump 4, at positions spaced apart from the sump 4.
  • the heated wash water may be stored in the sump 4. Accordingly, it is required to adjust the position and flow direction of the blowing fan 600 so that the blowing fan 600 may not cool the heated wash water.
  • the blowing fan 600 may be disposed between the sump 4 and the first evaporator 400.
  • the blowing direction of the blowing fan 600 may be opposite to the direction facing the sump 4. Accordingly, the blowing direction of the blowing fan 600 may forcibly blow air toward the first evaporator 400 but not toward the sump 4.
  • the second evaporator 500 may be disposed on one side of the tub 2.
  • the second evaporator 500 may be a tube-type heat exchanger and the second evaporator 500 may have a relatively large area, viewed in one direction.
  • the base 8 has a limited space, the second evaporator 500, it could be difficult to dispose the second evaporator 500 in the base 8.
  • the second evaporator 500 may be disposed on one side of the tub 2 in this embodiment, there is no need to change the size and structure of the second evaporator 500 according to eh space of the base 8 to arrange the second evaporator 500 in the limited space of the base 8, thereby increasing the space efficiency inside the dishwasher.
  • a water jacket 800 may be disposed on one side of the tub 2. Water may be stored in the water jacket 800, and the water stored in the water jacket 800 may heat-exchanged with the inside of the tub 2 through a lateral wall 2a of the tub 2.
  • the water jacket 800 may be configured to effectively remove moisture inside the tub 2 by condensing the water vapor generated during a drying process for dying the dishes held in the tub by using high-temperature air and existing inside the tub 2.
  • the second evaporator 500 may be disposed on the other side of the tub 2, where the water jacket 800 is not disposed.
  • the water jacket 800 may be disposed on one side of the tub 2 and the second evaporator 500 may be disposed on the other side thereof.
  • the tub 2 may include a lateral wall 2a defining one side.
  • the lateral wall 2a of the tub 2 be provided in a pair.
  • the water jacket 800 may be disposed on one lateral wall 2a and the second evaporator 500 may be disposed on the other lateral wall 2a.
  • the second evaporator 500 may be disposed outside the tub 2 to face the lateral wall 2a. Since the second evaporator 500 is disposed outside the tub 2, heat exchange between the evaporator 500 and the inside of the tub 2 may be considerably suppressed. Accordingly, it is somewhat suppressed to cool the heated wash water existing inside the tub 2, which occurs when the heated water is deprived of heat by the second evaporator 500.
  • an insulation member 700 may be disposed between the lateral wall 2a and the second evaporator 500.
  • the insulation member 700 may have a shape corresponding to the second evaporator 500, for example, a plate shape with a predetermined thickness.
  • the insulation member 700 may be disposed between the second evaporator 500 and the lateral wall 2a of the tub 2 and configured to block heat exchange between the tub and the second evaporator 500 by insulating therebetween.
  • the insulation member 700 disposed between the second evaporator 500 and the tub 2 may block the heated wash water existing in the tub from being deprived of heat by the second evaporator 500. Even when the second evaporator 500 is disposed on one side of the tub 2, the temperature of the heated wash water existing in the tub 2 may be effectively suppressed from becoming lower by the second evaporator 500, thereby increasing the energy efficiency of the dishwasher.
  • the second evaporator 500 may include a water tank 510 and a tube 520.
  • the water tank 510 may form a space for storing water.
  • the water stored in the water tank 510 may supply heat to the refrigerant passing through the second evaporator 500.
  • the refrigerant may absorb heat from the stored water and evaporate the heat.
  • the water tank 510 may have a shape corresponding to the lateral wall 2a of the tub 2, and a predetermined thickness to form an internal space. Due to this structure, the water tank 510 may be mounted on the lateral wall 2a of the tub 2 having a relatively large area to occupy a relatively large small space while having a considerable volume, so that a relatively large amount of water can be stored. Accordingly, a sufficient amount of water required by the heat exchange with the evaporator 500 may be stored in the water tank 510.
  • Water initially has a room temperature but if heat exchange between water and the refrigerant the heating of wash water continues by the continuous heating of the wash water, heat may be emitted and water can be cooled to be water having a temperature lower than a room temperature.
  • heat may be emitted and water can be cooled to be water having a temperature lower than a room temperature.
  • water may absorb heat from surrounding air again to have a room temperature.
  • the water tank 510 may be connected with the water supply portion 43 by a pipe.
  • the water tank 510 may store the water supplied water from the water supply portion 43 and discharge water to the water supply portion 43 if necessary.
  • the tube 520 may be disposed in an inner space of the water tank 510 and a plurality of bending areas may be formed in the tub so that the refrigerant may flow inside the tube 520.
  • the tube 520 may be disposed inside the water tank 510 in a structure in which a zigzag shape is repeated throughout.
  • a fin for transferring heat may protrude from an outer surface of the tube 520.
  • the condenser 200 disposed in the base 8 may be a plate-type heat exchanger.
  • the space in which the condenser 200 can be disposed inside the base 8 may be limited. Accordingly, when the condenser is manufactured as the tube-type heat exchanger, the volume of the condenser could be large due to the tube 520 provided considerably long so that it might become difficult to dispose the condenser inside the base 8.
  • the plate heat exchanger has high heat exchange efficiency between two working fluids (the wash water and the refrigerant here), it can have the same heat exchange efficiency as the tube type heat exchanger with a smaller volume compared to the tube type heat exchanger.
  • the condenser 200 may be manufactured as the plate heat exchanger so that the entire volume can be reduced enough to easily mount the condenser in the base 8 having the limited mounting space. Due to this structure, the space efficiency of the dishwasher may be improved.
  • the plate heat exchanger may change a distance between plates to control the heat exchange capacity.
  • FIG. 8 is a graph derived from the results of an experiment comparing the heating of wash water through an electric heater and a heat pump apparatus according to an embodiment.
  • the graphs show temperature changes of wash water over time, in case of heating the wash water by using the electric heater and in case of heating the washing water by using the heat pump apparatus 10 arranged in the structure according to the embodiment shown in FIG. 5 in the sump 4.
  • a hidden layer indicates the temperature change of wash water over time inside the sump 4, in case of heating the wash water by using the heat pump apparatus 10.
  • a solid line indicates the temperature change of wash water over time inside the sump 4, in case heating the wash water by using the electric heater.
  • the consumed electric energy was 420Wh in case of using the electric heater and 139Wh in case of using the heat pump apparatus 10. These values exclude the electrical energy consumed in the operation of the water pump (45).
  • the heat exchange amount in each device is 2000W in the condenser 200, 220W in the first evaporator 400 and 354W in the second evaporator 500.
  • the maximum temperature of the wash water at the beginning of heating is about 45° C. in both cases of using an electric heater and using the heat pump device 10.
EP23179500.6A 2022-06-21 2023-06-15 Geschirrspülmaschine mit einer wärmepumpenvorrichtung Pending EP4295742A1 (de)

Applications Claiming Priority (1)

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KR1020220075290A KR20230174405A (ko) 2022-06-21 2022-06-21 열펌프장치를 포함하는 식기세척기

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008136639A (ja) * 2006-12-01 2008-06-19 Hanshin Electric Co Ltd 食器洗浄乾燥装置
EP2064982A1 (de) 2009-02-09 2009-06-03 V-Zug AG Geschirrspüler mit Wärmepumpe
EP2682036A2 (de) * 2012-07-03 2014-01-08 Miele & Cie. KG Geschirrspülmaschine und Verfahren zum Aufheizen von Spülflotte in einer Geschirrspülmaschine
EP3257422A1 (de) * 2016-06-17 2017-12-20 Electrolux Professional S.p.A. Geschirrspülmaschine
WO2019132818A2 (en) * 2017-12-25 2019-07-04 Arcelik Anonim Sirketi A heat pump dishwasher with improved washing water heating performance
WO2019233819A1 (en) * 2018-06-08 2019-12-12 Arcelik Anonim Sirketi Heat pump dishwasher with enhanced evaporator efficiency

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008136639A (ja) * 2006-12-01 2008-06-19 Hanshin Electric Co Ltd 食器洗浄乾燥装置
EP2064982A1 (de) 2009-02-09 2009-06-03 V-Zug AG Geschirrspüler mit Wärmepumpe
EP2682036A2 (de) * 2012-07-03 2014-01-08 Miele & Cie. KG Geschirrspülmaschine und Verfahren zum Aufheizen von Spülflotte in einer Geschirrspülmaschine
EP3257422A1 (de) * 2016-06-17 2017-12-20 Electrolux Professional S.p.A. Geschirrspülmaschine
WO2019132818A2 (en) * 2017-12-25 2019-07-04 Arcelik Anonim Sirketi A heat pump dishwasher with improved washing water heating performance
WO2019233819A1 (en) * 2018-06-08 2019-12-12 Arcelik Anonim Sirketi Heat pump dishwasher with enhanced evaporator efficiency

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